波長信號的解調是實現(xiàn)光纖光柵傳感網絡的關鍵，基于現(xiàn)有的光纖光柵傳感器解調方法，提出一種基于FPGA的雙匹配光纖光柵解調方法，此系統(tǒng)是一種高速率、高精度、低成本的解調系統(tǒng)，并且通過引入雙匹配光柵有效地克服了雙值問題同時擴大了檢測范圍。分析了光纖光柵的測溫原理并給出了該方案軟硬件設計，綜合考慮系統(tǒng)的解調精度和FPGA的處理速度給出了基于拉格朗日的曲線擬合算法。 Abstract: Sensor is one of the most important application of the fiber grating. Wavelength signal demodulating is the key techniques to carry out fiber grating sensing network， based on several existing methods of fiber grating sensor demodulation inadequate， a two-match fiber grating demodulation method was presented. This system is a high-speed， high precision， low-cost demodulation system. And by introducing a two-match grating effectively overcomes the problem of double value while expands the scope of testing. This paper analyzes the principle of fiber Bragg grating temperature and gives the software and hardware design of the program. Considering the system of demodulation Accuracy and processing speed of FPGA，this paper gives the curve fitting algorithm based on Lagrange.
標簽： FPGA 光纖光柵 解調系統(tǒng)
上傳時間： 2013-10-10
上傳用戶：zxc23456789
為了提高直接轉矩控制（DTC）系統(tǒng)定子磁鏈估計精度，降低電流、電壓測量的隨機誤差，提出了一種基于擴展卡爾曼濾波（EKF）實現(xiàn)異步電機轉子位置和速度估計的方法。擴展卡爾曼濾波器是建立在基于旋轉坐標系下由定子電流、電壓、轉子轉速和其它電機參量所構成的電機模型上，將定子電流、定子磁鏈、轉速和轉子角位置作為狀態(tài)變量，定子電壓為輸入變量，定子電流為輸出變量，通過對磁鏈和轉速的閉環(huán)控制提高定子磁鏈的估計精度，實現(xiàn)了異步電機的無速度傳感器直接轉矩控制策略，仿真結果驗證了該方法的可行性,提高了直接轉矩的控制性能。 Abstract: In order to improve the Direct Torque Control（DTC） system of stator flux estimation Accuracy and reduce the current， voltage measurement of random error， a novel method to estimate the speed and rotor position of asynchronous motor based on extended Kalman filter was introduced. EKF was based on d-p axis motor and other motor parameters （state vector: stator current， stator flux linkage， rotor angular speed and position； input: stator voltage； output: staror current). EKF was designed for stator flux and rotor speed estimation in close-loop control. It can improve the estimated Accuracy of stator flux. It is possible to estimate the speed and rotor position and implement asynchronous motor drives without position and speed sensors. The simulation results show it is efficient and improves the control performance.
標簽： EKF 異步電機 直接轉矩 控制系統(tǒng)
上傳時間： 2015-01-02
上傳用戶：qingdou
Abstract: Many modern industrial, medical, and commercial applications require temperature measurements in the extended temperature rangewith accuracies of ±0.3°C or better, performed with reasonable cost and often with low power consumption. This article explains how platinumresistance temperature detectors (PRTDs) can perform measurements over wide temperature ranges of -200°C to +850°C, with absolute Accuracyand repeatability better than ±0.3°C, when used with modern processors capable of resolving nonlinear mathematical equation quickly and costeffectively. This article is the second installment of a series on PRTDs. For the first installment, please read application note 4875, "High-Accuracy Temperature Measurements Call for Platinum Resistance Temperature Detectors (PRTDs) and Precision Delta-Sigma ADCs."
上傳時間： 2013-11-06
上傳用戶：WMC_geophy
Delta-sigma ADCs, with their high Accuracy and high noiseimmunity, are ideal for directly measuring many typesof sensors. Nevertheless, input sampling currents canoverwhelm high source impedances or low-bandwidth,micropower signal conditioning circuits. The LTC®2484family of delta sigma converters solves this problem bybalancing the input currents, thussimplifying or eliminatingthe need for signal conditioning circuits.
上傳時間： 2015-01-03
上傳用戶：潛水的三貢
Description: FASBIR(Filtered Attribute Subspace based Bagging with Injected Randomness) is a variant of Bagging algorithm, whose purpose is to improve Accuracy of local learners, such as kNN, through multi-model perturbing ensemble. Reference: Z.-H. Zhou and Y. Yu. Ensembling local learners through multimodal perturbation. IEEE Transactions on Systems, Man, and Cybernetics - Part B: Cybernetics, 2005, vol.35, no.4, pp.725-735.
標簽： Description Randomness Attribute Filtered
上傳時間： 2015-04-10
上傳用戶：ynzfm
The information in this publication is believed to be accurate as of its publication date. Such information is subject to change without notice and The ATM Forum is not responsible for any errors. The ATM Forum does not assume any responsibility to update or correct any information in this publication. Notwithstanding anything to the contrary, neither The ATM Forum nor the publisher make any representation or warranty, expressed or implied, concerning the completeness, Accuracy, or applicability of any information contained in this publication. No liability of any kind shall be assumed by The ATM Forum or the publisher as a result of reliance upon any information contained in this publication.
標簽： publication information believed accurate
上傳時間： 2015-09-16
上傳用戶：1109003457
THIS PROGRAM IS PROVIDED "AS IS". TI MAKES NO WARRANTIES OR REPRESENTATIONS, EITHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, LACK OF VIRUSES, Accuracy OR COMPLETENESS OF RESPONSES, RESULTS AND LACK OF NEGLIGENCE. TI DISCLAIMS ANY WARRANTY OF TITLE, QUIET ENJOYMENT, QUIET POSSESSION, AND NON-INFRINGEMENT OF ANY THIRD PARTY INTELLECTUAL PROPERTY RIGHTS WITH REGARD TO THE PROGRAM OR
標簽： REPRESENTATIONS WARRANTIES PROVIDED PROGRAM
上傳時間： 2015-09-16
上傳用戶：zq70996813
The programs and applications on this disk have been carefully tested, but are not guaranteed for any particular purpose. The publisher does not offer any warranties and does not guarantee the Accuracy, adequacy, or completeness of any information and is not responsible for any errors or omissions or the results obtained from use of such information.
標簽： applications guaranteed carefully programs
上傳時間： 2013-12-20
上傳用戶：xzt
This article describes Atmel’s FingerChip technology for electronic fingerprint sensing that combines the advantages of small size, low cost, high Accuracy, zero maintenance, low energy consumption and portability. This technology has applications in a wide range of fixed and portable secured devices including access control systems, cash terminals, public transport, PCs, PDAs, Smart Card readers and motor vehicles. It can be used in almost any situation where rapid, reliable and accurate identification or authentication of an individual is required.
標簽： fingerprint FingerChip technology electronic
上傳時間： 2013-12-27
上傳用戶：h886166
water temperature control system uses the Single Chip Microcomputer to carry on temperature real-time gathering and controling. DS18B20, digitized temperature sensor, provides the temperature signal by "a main line". In -10～+85℃ the scope, DS18B20’s inherent measuring Accuracy is 0.5 ℃. The water temperature real-time control system uses the electricity nichrome wire carring on temperature increiseament and operates the electric fan to realize the temperature decrease control. The system has the higher measuring Accuracy and the control precision, it also can complete the elevation of temperature and the temperature decrease control.
標簽： temperature Microcomputer real-tim control
上傳時間： 2015-12-10
上傳用戶：nairui21
